Reactive-Disperse Mixed Dye Wastewater Treatment Using Advanced Oxidation Process

摘要

This paper studied the efficiency of another series of advanced oxidation processes involving the useof a chelating ligand, combined with a transition metal forming the transition metal complexes toproduce reactive radicals. Previous reports using this H 2 O 2 /pyridine/Cu(II) system focused only on thedecolorization of a single synthetic dye wastewater. In practice, real dye wastes contain mixture ofdyes. Therefore, in this study, we combined two classes of most widely used dyes namely thereactive dye (RD) and disperse dye (DD) in three different ratios of (RD: DD) = (0.25:0.75), (0.50:0.50),and (0.75:0.25) to obtain a better idea of the trend in the treatment efficiency of this system. Experimentalresults are assessed in terms of percentage chemical oxygen demand (COD) reduction, decolourisation,and the amount of sludge produced. Optimal concentrations were obtained using statistical design ofexperiment. At optimal concentrations, for (RD:DD) = (0.25:0.75), (0.50:0.50), and (0.75:0.25), thepercentage of COD reduction was recorded at 87%, 86% and 81%, respectively, decolourization at97%, 98% and 96%, respectively while sludge produced was 185 mg/L, 125 mg/L, and 210 mg/L,respectively.